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LTC7803 Datasheet(PDF) 7 Page - Analog Devices

Part # LTC7803
Description  40V Low IQ, Triple Output, 3-Phase Synchronous Step-Down Controller
PDF  36 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

LTC7803 Datasheet(HTML) 7 Page - Analog Devices

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LTC7819
7
Rev. 0
For more information www.analog.com
TYPICAL PERFORMANCE CHARACTERISTICS
Current Sense Threshold vs ITH
Voltage
SENSE1,2,3– Input Current
vs VSENSE Voltage
Maximum Current Sense
Threshold vs SENSE Common
Mode Voltage
Foldback Current Limit
SENSE1,2,3– Input Current
vs Temperature
SENSE1,2,3+ Input Current
vs Temperature
Oscillator Frequency
vs Temperature
Output Voltage Noise Spectrum
RUN Pin Thresholds vs
Temperature
PULSE-SKIPPING
BURST MODE
FORCED CONTINUOUS
ITH VOLTAGE (V)
0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
–30
–20
–10
0
10
20
30
40
50
7819 G10
SENSE1– CURRENT
SENSE2– OR SENSE3– CURRENT
MODE = INTVCC
SENSE VOLTAGE (V)
0
5
10
15
20
25
30
35
40
0
100
200
300
400
500
600
700
800
900
vs Voltage
SENSE1,2– and SENSE3+ Current
7819 G11
SENSE VOLTAGE (V)
0
5
10
15
20
25
30
35
40
0
10
20
30
40
50
60
70
vs SENSE Common Mode Voltage
Maximum Current Sense Threshold
7819 G12
FEEDBACK VOLTAGE (mV)
0
100 200 300 400 500 600 700 800
0
10
20
30
40
50
60
70
Buck Foldback Current Limit
7819 G13
SENSE1– = INTVCC – 0.5V
SENSE2–,SENSE3– = INTVCC – 0.5V
SENSE = INTVCC + 0.5V
MODE = INTVCC
TEMPERATURE (°C)
–55 –25
5
35
65
95
125 155
–100
0
100
200
300
400
500
600
700
800
900
7819 G14
MODE = INTVCC
SENSE = 0V
SENSE = 1V
SENSE = 3.3V
SENSE = 12V
TEMPERATURE (°C)
–55 –25
5
35
65
95
125 155
–1.0
–0.8
–0.6
–0.4
–0.2
0.0
0.2
0.4
0.6
0.8
1.0
7819 G15
RFREQ = 374k (100kHz)
RFREQ = 75k (500kHz)
RFREQ = 12k (3MHz)
FREQ = GND (380kHz)
FREQ = INTVCC (2.25MHz)
TEMPERATURE (°C)
–55 –25
5
35
65
95
125 155
–4
–3
–2
–1
0
1
2
3
4
5
6
7819 G16
FIGURE 9 CIRCUIT
RBW = 510Hz, PEAK-HOLD
PLLIN/SPREAD = GND
PLLIN/SPREAD = INTVCC
FREQUENCY (kHz)
200
400
600
800
1000 1200 1400
–100
–90
–80
–70
–60
–50
–40
–30
–20
–10
0
7819 G17
RISING
FALLING
TEMPERATURE (°C)
–55 –25
5
35
65
95
125 155
1.06
1.08
1.10
1.12
1.14
1.16
1.18
1.20
1.22
1.24
1.26
7819 G18



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